<template>
    <div>
      <!--面包屑导航区域-->
      <el-breadcrumb separator-class="el-icon-arrow-right">
        <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
        <el-breadcrumb-item>商品管理</el-breadcrumb-item>
        <el-breadcrumb-item>添加商品</el-breadcrumb-item>
      </el-breadcrumb>
      <!--卡片视图区域-->
      <el-card>
        <!--提示区域-->
        <el-alert
          title="添加商品信息"
          type="info"
          center
          show-icon
          :closable="false">
        </el-alert>
        <!--步骤条-->
        <el-steps :space="200" :active="activeIndex - 0" finish-status="success" align-center>
          <el-step title="基本信息"></el-step>
          <el-step title="商品参数"></el-step>
          <el-step title="商品属性"></el-step>
          <el-step title="商品图片"></el-step>
          <el-step title="商品内容"></el-step>
          <el-step title="完成"></el-step>
        </el-steps>
        <!--tab区域-->
        <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px" label-position="top">
          <el-tabs v-model="activeIndex" :tab-position="'left'" :before-leave="beforeTabLeave" @tab-click="tabClicked">
            <el-tab-pane label="基本信息" name="0">
              <el-form-item label="商品名称" prop="goods_name">
                <el-input v-model="addForm.goods_name"></el-input>
              </el-form-item>
              <el-form-item label="商品价格" prop="goods_price">
                <el-input v-model="addForm.goods_price" type="number"></el-input>
              </el-form-item>
              <el-form-item label="商品重量" prop="goods_weight">
                <el-input v-model="addForm.goods_weight" type="number"></el-input>
              </el-form-item>
              <el-form-item label="商品数量" prop="goods_number">
                <el-input v-model="addForm.goods_number" type="number"></el-input>
              </el-form-item>
              <el-form-item label="商品分类" prop="goods_cat">
                <el-cascader
                  v-model="addForm.goods_cat"
                  :options="cateList"
                  expandTrigger="hover"
                  :props="cateProps"
                  @change="handleChange"></el-cascader>
              </el-form-item>
            </el-tab-pane>
            <el-tab-pane label="商品参数" name="1">
              <!--渲染表单的item项-->
              <el-form-item :label="item.attr_name" v-for="item in manyTableData" :key="item.attr_id">
                <!--复选框组-->
                <el-checkbox-group v-model="item.attr_vals" >
                  <el-checkbox :label="cb" v-for="(cb, i) in item.attr_vals" :key="i" border></el-checkbox>
                </el-checkbox-group>
              </el-form-item>
            </el-tab-pane>
            <el-tab-pane label="商品属性" name="2">
              <el-form-item :label="item.attr_name" v-for="item in onlyTableData" :key="item.attr_id">
                <el-input v-model="item.attr_vals"></el-input>
              </el-form-item>
            </el-tab-pane>
            <el-tab-pane label="商品图片" name="3">
              <!--action表示图片要上传到后台API地址-->
              <el-upload
                :action="uploadURL"
                :on-preview="handlePreview"
                :on-remove="handleRemove"
                list-type="picture"
                :headers="headerObj"
                :on-success="handleSuccess">
                <el-button size="small" type="primary">点击上传</el-button>
              </el-upload>
            </el-tab-pane>
            <el-tab-pane label="商品内容" name="4">
              <!--富文本编辑器组件-->
              <quill-editor
                v-model="addForm.goods_introduce">
              </quill-editor>
              <el-button type="primary" class="btnAdd" @click="add">添加商品</el-button>
            </el-tab-pane>
         </el-tabs>
        </el-form>
      </el-card>

      <!--图片预览-->
      <el-dialog
        title="图片预览"
        :visible.sync="previewVisible"
        width="50%">
        <img :src="previewPath" alt="" class="previewImg">
      </el-dialog>
    </div>
</template>

<script>
import request from 'api/request'
import _ from 'lodash'

export default {
  name: 'Add',
  data () {
    return {
      activeIndex: '0',
      // 添加商品的表单数据对象
      addForm: {
        goods_name: '',
        goods_price: 0,
        goods_weight: 0,
        goods_number: 0,
        // 商品所属的分类数组
        goods_cat: [],
        // 图片的数组
        pics: [],
        // 商品的详情描述
        goods_introduce: '',
        attrs: []
      },
      addFormRules: {
        goods_name: [
          {required: true, message: '请输入商品名称：', trigger: 'blur'},
        ],
        goods_price: [
          {required: true, message: '请输入商品价格：', trigger: 'blur'}
        ],
        goods_weight: [
          {required: true, message: '请输入商品重量：', trigger: 'blur'}
        ],
        goods_number: [
          {required: true, message: '请输入商品数量：', trigger: 'blur'}
        ],
        goods_cat: [
          {required: true, message: '请选择商品分类：', trigger: 'blur'}
        ],

      },
      cateList: [],
      cateProps: {
        label: 'cat_name',
        value: 'cat_id',
        children: 'children'
      },
      // 动态参数列表数据
      manyTableData: [],
      // 静态参数列表数据
      onlyTableData: [],
      // 上传图片的url地址
      uploadURL: 'https://www.liulongbin.top:8888/api/private/v1/upload',
      // 图片上传组件的headers请求头对象
      headerObj: {
        Authorization:
        window.sessionStorage.getItem('token')
      },
      previewPath: '',
      previewVisible: false
    }
  },
  created () {
    this.getCateList()
  },
  methods: {
    // 获取所有商品分类数据
    async getCateList () {
      const {data:res} = await request('categories')
      if(res.meta.status !== 200) {
        return this.$message.error('获取商品数据失败！')
      }
      this.cateList = res.data
    },
    // 级联选择器选中项彼岸花，会触发这个函数
    handleChange () {
      if(this.addForm.goods_cat.length !== 3){
        this.addForm.goods_cat = []
      }
    },
    beforeTabLeave (activeName, oldActiveName) {
      if(oldActiveName === '0' && this.addForm.goods_cat.length !== 3){
        this.$message.error('请先选择分类！')
        return false
      }
    },
    async tabClicked () {
      if(this.activeIndex === '1'){
        const {data:res} = await request(`categories/${this.cateId}/attributes`,{sel:'many'})
        if(res.meta.status !== 200) {
          return this.$message.error('获取动态参数列表失败！')
        }
        res.data.forEach(item => {
          item.attr_vals = item.attr_vals.length === 0 ? [] : item.attr_vals.split(' ')
        })
        this.manyTableData = res.data
      } else if (this.activeIndex === '2') {
        const {data:res} = await request(`categories/${this.cateId}/attributes`,{sel:'only'})
        if(res.meta.status !== 200){
          return this.$message.error('获取静态属性失败！')
        }
        this.onlyTableData = res.data
      }
    },
    // 处理图片预览效果
    handlePreview (file) {
      this.previewPath = file.response.data.url
      this.previewVisible = true
    },
    // 处理移除图片的操作
    handleRemove (file) {
      // 1、获取将要删除的图片的临时路径
      const filePath = file.response.data.tmp_path
      // 2、从pics数组中，找到这个图片对应的索引值
      const i = this.addForm.pics.findIndex(x => {
        x.pic === filePath
      })
      // 3、调用数组的splice方法，把图片信息对象，从pics数组中移除
      this.addForm.pics.splice(i,1)
    },
    // 监听图片上传成功的事件
    handleSuccess (response) {
      // 1、拼接得到一个图片信息对象
      const picInfo = {pic: response.data.tmp_path}
      // 2、将图片信息对象，push到数组中
      this.addForm.pics.push(picInfo)
    },

    add () {
      this.$refs.addFormRef.validate(async valid => {
        if(!valid){
          return this.$message.error('请填写必要的表单信息!')
        }
        // lodash cloneDeep(obj)
        const form = _.cloneDeep(this.addForm)
        form.goods_cat = form.goods_cat.join(',')
        this.manyTableData.forEach(item => {
          const newInfo = {
            attr_id: item.attr_id,
            attr_value: item.attr_vals.join(' ')
          }
          this.addForm.attrs.push(newInfo)
        })
        this.onlyTableData.forEach(item => {
          const newInfo = {
            attr_id: item.attr_id,
            attr_value: item.attr_vals
          }
          this.addForm.attrs.push(newInfo)
        })
        form.attrs = this.addForm.attrs
        const {data:res} = await request('goods',form,'post')
        if(res.meta.status !== 201){
          return this.$message.error(res.meta.msg)
        }
        this.$message.success('添加商品成功!')
        this.$router.push('/goods')
      })
    }
  },
  computed: {
    cateId() {
      if(this.addForm.goods_cat.length === 3){
        return this.addForm.goods_cat[2]
      }
      return null
    }
  }
}
</script>

<style scoped lang="less">
 .el-checkbox {
   margin: 0 10px 0 0 !important;
 }

  .previewImg {
    width: 100%;
  }

  .btnAdd {
    margin-top: 15px;
  }
</style>
